(356) 



Ptcrygoneurum cavifolium (Ehrh.) Jur. River bank, on 

 bare sand}' soil, April 12 ; Columbia Falls (240). 



Pottia Heimii (Hedvv.) Br. & Sch. Lower Sand Coulee, 

 Missouri River, near Great Falls, June 17 (46). 



Pottia Heimoides Kindb. The capsule is much more elon- 

 gated than in the preceding, with a row of pale, slightly 

 transversely elongated, smaller cells about the mouth, 

 scarcely forming an annulus however. The seta apparently 

 becomes dark red with age. Vein toward apex of leaf either 

 vanishing or excurrent. July 9, shore of St. Mary's Lake 

 and Cut-bank Cr., Blackfeet Ind. Reservation, Lower Sand 

 Coulee, Columbia Falls (47). 



Didymodon rubellus (Hoffm.) Br. & Sch. Belt Mts., Great 

 Falls, July; Columbia Falls, Oct. (55). 



Didymodon tophaceus (Brid.) Jur. Great Falls, in wet 

 crevices of rock, Nov. and March (12). 



Didymodon cylindricus (Bruch.) Br. & Sch. Only found 

 on a single log in the Flathead River bottom at Columbia 

 Falls. Specimens small and sterile (329). 



Ditrichum giganteum R. S. Williams, Bull. N. Y. Bot. 

 Garden, Vol. 2, No. 6: 113, 1901. Plate 15. Belt Mts., 

 Columbia Falls, fruiting on wet sand, July 30(110). 



Ditrichum jlexicaule (Schleich.) Hampe. Bad-rock Canon, 

 Flathead River, July 8 ; Belt Mts. (294). 



Ditrichum ambiguum Best. Bad-rock Canon, on earth 

 3,300 ft., June 24 ; Essex, G. N. Ry., 4,300 ft., August 5 (241). 



Desmatodon latifolius (Hedw.) Br. & Sch. Neihart, Belt 

 Mts., 6,000 ft., Essex, G. N. Ry., 4,400 ft. ; Two-medicine 

 Lake and Big Badger Cr., Blackfeet Ind. Reservation, July 



Desmatodon latifolius muticus Brid. Forty-mile Cr. and 

 Two-medicine Lake, Blackfeet Ind. Reservation, August 15 



(4 2 3)- 



Desmatodon ccrnuus (Hueben.) Br. & Sch. Near mouth of 



Sand Coulee, Aug. 27 ; Tenderfoot Cr., Belt Mts (51). 



Desmatodon arenaccus Sulliv. & Lesq. Tenderfoot Cr. ; 



Sand Coulee, Aug. 13 (56). This species is sometimes con- 



